Marking tool for locating strike plates



U6 ELL ED lfiimz BEEHLEE, 1 162052, 6 one (wows/.4, A I'm/2 mm .EQEBNER,

F. J. RUSSELL MARKING TOOL FOR LOCATING STRIKE PLATES Filed April 5, 1950 May 19, 1953 Patented May 19, 1953 2,388,682 TQOL EGKLQCATI NG: STRIKE PLATES Freud. Russell; Bever Hills, Calif. ,asSi jD ;-liy' ineshehssiiiments; to Loyola- University Foam calm, a moment eurosdati'on, Iufos Angeles, nationioi'. California.

AiiplicationApril ii', 1950 ,seminarians invention relates to a marking tooli for 10'- cating, the position of 'strikeplates' to door frames of'hore-in type lockcoinbinations. 1 conventionally such a lock is mounted a door and the cooperating strike plate is mounted on the door frame The correct location of the strike plate with reference to the latchv bolt of the lock is critical. for satisfactory functioning of? the lock and strike plate combination. The Straight edge or the central opening in the strike plate which engages the latch bolt must not only register vertically with the latter but must have a horizontal location such that when the door is fully closed against the stop the flat side of'the latchbolt Will advance. past the stifai'ght edge, of: the strike plate. and be retained by the, latter against door opening movement. until the latch bolt is withdrawn. clearance between the latch bolt, and'sti'aight edge inust'beat miiiiinum ol' ly enough to assure easy tra'vel.oithe la'tch, bolt or out; any excessive clearance resultihg, in a loose andfrattling, door, and insufflcient clearance rendering, advancement ofthe latch bolt impossilike and therefore preventin the, door from "being; locked shut; p

In: conventional, practice the first stepfiis to installi the lock in the door.v Measurements. are then taken vertically and horizontally to locate asaccu'rately as possible the proper position on the, door. frame for mounting the strike. plate. This also 'involves,;the harming of a; cut-out. nor the strike, plateand a hole. extending inwardly from the cut-out to accommodate the latch bolt. There has. been no, tool or. satisfactory method; 01: making, the, measurements andlflboaiting the position, of. the Strike; plate. Atl best. the mease: urements haveheen, approximate withrthe-nesult that While in somecases thelocations have'proved to he'acourate, in et/her installations it has been necessary to employ. a trial and. error method, sometimes removingthestrike plate and moving it higher or lower; o-rin orsout. When this has to be done sometimes part of-the cut-outdnthe frame is exposed, sometimes themew locationyof the woodtscrews holding; thes stnike plate in: is sopclose totthe original position of the sorews that torn-enlarged screw holes; resultvandithe attachment is..unsecure. These and other conditions often result in an unworkmanlike job.

Theobject of my invention-is to overcome the di'iilhulties indicated more spec'ifieally, topr'ovide a speoial-i-n-arking toorwriitn can ne inserted-into the hole prepared in the door for the bore-in lock and while being guided by the wall of the hole may be driven against the door frame with 2" Claims; (Cl.

t v the door in nillyclosed position 'for'the purpose of marking. the location for the strike plate.

"Thejmark in the door" frame may be used as the. index: for a circular hole to be bored, which latter in turnwill provide". the index for a con veiltion'al morti'sin'g' tool which win make in the correct; location the rectangular cut-out required by the outline of 'the strike plate; or" the original mark on the door frame mavbe used'a's the index to first make a rectangular cut-outforthe strike plate and then utilizing, the mark'as a center for boring a hole. In both cases, the 11018 mummy serves to provide the required clearance hack of the strike. plate opening; through which the lat h lo'olt passes.

The foregoing and additional objects of" the invention will become apparent from a further consideration of the description taken conjunction Withithe drawings. 1

In. the drawihgs.:'

Figure 1 a perspective view of'iny special" marking t'ool'.

Figure 2 is av side view 'of"th'e' marking roar shown. in position for marking a door flame. Figure 3 "is a "fragmentary perspective view partly in section of the irazneofFigurel 2"marked for locating, the strike plait'e'. v

Figure 4 is-a horizontalfcross section of'a frame assembly as sh'own in Figurefiaillus trating the use of a bit in utilizing the mark shown in Fig;- ures 2 ands.

To explain. in more de'ta-i-ll the purpose and function/oi my tooLjreference ismade tofEigure 2}, wherein a door. 2B is adapted tobe closed adjacent to awdoor frame 2]. againstiaustop unsecured to the frame. Trim; 23 out the frame is; included in. the illustration merely. to complete the A hole-24: isiboredrthnough the door :andia-ch ole 25 is boredtrom; the edgzeeof the: door through tointersect-V with. the. hole-14. Most: standard borevin. lockswarermadeof dimensions V which ordinan-Ly:- callr-for then-hole 12-5: to; be of (a twoiinch diameter-and .-the1-hole 125:tobezoiiwarone inch {dirameteri-r These measurements rarer by yway of illustration only and are referred to only because they apply toslpresent standards. :Refierence'ito suchz'dimensions heminafiter is ion the purpose of: identification. only andi :notz iof limitation: 'l he length ofth'e hore of the hole fli is sufiioientfito provide suflicient longitudinal wall sunface' tlidt an element' which' "fits the bore' 'can he axially guided without wobbling.

My special marking tool 26 comprises an annular plug or piston-like body 21 with a. flat I01- ward end face 28 preferably from the center of which extends a pointed punching element 29.

This element 29 is preferably of circular tapered bit, as shown in Figure 4, or the tapered pointof a mortising tool (not shown).

The rear end of the marking .tool is preferably provided with a tapered end shoulder 31 to facilitate inserting the tool into the bore hole in the door from the outside. A short stem 32 forms the rear terminal end of the tool' and provides an annular notch 33 between the annular surface of the stem 32 and the fiat end portion 34, which notch is suitable for engagement by a tool, asfor example a screw driver 35, which can be inserted angularly through the hole 24 in the door. A blow struck against the screw driver or some other rigid tool when positioned as shown in Figure 2 will drive the marking tool 26 forwardly into contact with the door frame and cause the punch element 29 to make the mark illustrated in Figures 2 and 3.

' It is important that the diameter of the piston-like body 21 be approximately the same as the diameter of the hole 25, at least the respective' dimensions be sufficiently close that the hole which is ordinarily somewhat elongated like a cylinder will provide a snug fitting guide for the marking tool whereby the indentation mark when made will be accurately located- The length should be'greater than the length of the borehole 25 so that the rear end of the tool is accessible through the side hole 24. Ordinarily when the diameter of the tool body 21 is approximately one inch, the length will be approximately two inches.

The tool may be of any suitable materialbut ordinarily a case hardened steel or tool steel gives the best results. 7

In Figure 4 is shown the use of a drill bit 40 boring what will ordinarily be a one inch hole 41 in the door frame to provide the necessary space for the latch to enter through the strike plate. The cut-out for the strike plate, shown in broken lines in Figure 3, may be formed by a mortising tool or chisel before or after the hole 4| is bored. A mortising tool may be employed which has a guide pin that is caused to register with the indentation mark 30 or causedto register with the hole 4| which has been bored with the indentation mark 30 acting as a center. While I have herein shown and described my invention in what I have conceived to be the most practical and preferred embodiment, it is recognized that departures may be made therefrom within the scope of my invention, which is not to be limited to the details disclosed herein but isto be accorded the full scope of the claims so as to embrace any and all equivalent devices.

The forward end need not have a flat face as illustrated, the essential thing being the presence of a punch or marker which will make either a small indent mark or out which is distinguishable. r The rearend neednot be shaped with the 4 particular annular notch shown. if a straight tool such as a screwdriver or a conventional center punch is to be used, it is desirable to embody in my marking tool, the annular notch, or some equivalent comprising a depression or a ing or other stop against which the screwdriver or center punch may engage.

The plug or piston-like body need not be truly cylindrical, but can be modified provided the diametrical surface extremities will slidably engage and be guided by the wall of the bore hole 25 which is cylindrical.

Having described my invention, what I claim as newand desireto secure by Letters Patent is:

1. A method of mounting respective parts of bore-in lock hardware respectively in a door and frame therefor by, employment of a marking tool of selected length and diameter comprising boring a sidehole in the door at a point spaced from a free swinging edge thereof, boring a bore hole at thesame level in the'free swinging edge from the edge to meet the side hole,selecting a marking tool of diameter providing a snug sliding fit in the bore hole and inserting said marking tool from the edge into the bore hole to a position wherein one end is exposed to the side hole and the other end is within the surface of the edge, closing the door to a stop position in the frame and. there driving said marking tool outwardly to eife'ct a, score on the frame, then with the door withdrawn from the frame boring a bolt hole in the frame in a location which corresponds to the score for locating a strike plate accurately in position.

2. A method of mounting respective parts of bore-in lock hardware respectively in a door and frame thereforby employment of a marking tool of selected length and diameter comprising locating a relatively larger side hole in the door at a point spaced from a freeiswinging edge thereof andboring said side hole, locating a relatively smaller bore hole' at the same level on the free swinging edge and boring said bore hole from the edge to meet the side hole, selecting amarking tool of diameter providing a snug slidingfit in the bore hole and inserting said marking tool from the edge into the bore hole to a position wherein one end is exposed to the side hole and. the other end is within the surface of the edge, closing'the door to a stop position in the frame and there driving said marking tool outwardly to effect a score on the frame, then with the door withdrawn from the frame outlining a strike plate cut-out pattern on the frame surrounding the score, boring a bolt hole in the frame, the bolt hole being in a location which corresponds to the score, and clearing the cut-out pattern for locating the strike plate accurately in position.

FRED J. RUSSELL. 

